Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80b41e96f035ec7…

MALICIOUS

PDF

72.5 KB Created: 2021-04-03 09:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da57deada426920daeab23eabac5fe4f SHA-1: 562ddf8784e24de2e1048c483c356e391cc8ff55 SHA-256: d80b41e96f035ec70f062274711da955620aba3d4eb8885d14c3432c7aa7ef54
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior, with a high number of distinct hosts and disposable domains used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/award?keyword=single+variable+calculus+early+transcendentals+8th+edition+pdf+reddit PDF link annotation
    • http://waverufusufafuv.scienceontheweb.net/97403596829.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/borawoxevosigaliginirinaz.pdfIn PDF document text
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/fekabu.pdfIn PDF document text
    • http://bostpolamos.site/22127181218q9ctc.pdfIn PDF document text
    • http://damvglaz0.xyz/how_often_do_you_feed_dermestid_beetlesjbsue.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/medicine_daughter_piano_sheet_music.pdfIn PDF document text
    • http://priz24.site/gunorinexuresolibisimukewsgd0w.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/563bda0728002.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/brimstone_missile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/9547036089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d63ccb-775a-430a-b3fe-4f69560b0f98/lobururobedizoradekadel.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/27677152938.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_36827529613544238f7bec5a0cc8ccbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofiguj/hyrule_warriors_definitive_edition_costumes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e03ef96-6ba3-41f1-92bb-87a17e7c032b/napimatoxolawov.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/b_flat_clarinet_star_wars_sheet_music.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_2201f9dc61ab4ce3bca5a24e53157c62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e842e237-13aa-409e-8892-d6b2fcfb5edf/81011187319.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 6016 bytes
SHA-256: 23528c5622af9db7d239a4d241392115f9f59f5e1363b39364cc7eae9194fa0b
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 11260 bytes
SHA-256: ad553ff969f76d22101d30ae3b65faf26c2151e49f0057aa5513fe7374db9697

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